1A3C

PYRR, THE BACILLUS SUBTILIS PYRIMIDINE BIOSYNTHETIC OPERON REPRESSOR, DIMERIC FORM

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	PYRIMIDINE OPERON REGULATORY PROTEIN PYRR	polymer	181	20290.3	1	UniProt (P39765) Pfam (PF00156) In PDB	Bacillus subtilis	PYRR
2	A	SAMARIUM (III) ION	non-polymer		150.4	2	Chemie (SM)
3	A	SULFATE ION	non-polymer		96.1	1	Chemie (SO4)
4		water	water		18.0	257	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	20290.3
Non-Polymers*	Number of molecules	3
	Total formula weight	396.8
All*	Total formula weight	20687.1

*Water molecules are not included.